YDKJ (PS3) $14.97
YDKJ (Wii) $15.22
They also have it on DS for $4.99 + $4.59 shipping through a third-party seller.
This came across the CAG tracker earlier today; it seems to go for about $20 normally. I highly recommend it for any trivia junkies out there. With 73 episodes, you won't be repeating Jack questions for at least 15 hours of gameplay. It also has a lot of content with great DLC in case you blow through all the episodes quickly.
Edited by masterledz, 24 June 2012 - 10:50 PM.